Last year I was told by personnel at the Earhart campground they would be open during the game time. Not sure if all of the three areas will be open. Nice folks, GREAT location. Mostly "dry" camping.
Don't know for sure about the others but there are many CG locations within a half mile of the speedway. Unlike most of its sister tracks, BMS doesn't own the camping areas adjacent to the speedway, but they seem to be cooperative with info and list the CG info on their website. http://www.bristolmotorspeedway.com/...-property.html